CN106163027A - Light source drive device and light source driving method - Google Patents
Light source drive device and light source driving method Download PDFInfo
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- CN106163027A CN106163027A CN201510136623.6A CN201510136623A CN106163027A CN 106163027 A CN106163027 A CN 106163027A CN 201510136623 A CN201510136623 A CN 201510136623A CN 106163027 A CN106163027 A CN 106163027A
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Abstract
The invention discloses a kind of light source drive device and light source driving method.When outside the feedback voltage of LED serial falls within predetermined voltage range; the driving voltage of LED serial is adjusted to starting voltage value; and the magnitude of voltage of the driving voltage that gradually adds up is not until feedback voltage falls within outside predetermined voltage range; to avoid abrupt voltage wave to damage LED serial; and the load change of respective leds tandem allows the driver element optimal driving voltage of output carry out driven for emitting lights diode tandem, effectively protect LED serial and make its normal operation.
Description
Technical field
The present invention relates to a kind of driving means, and particularly to a kind of light source drive device and light source driving method.
Background technology
Along with the demand of carbon reduction increases day by day, light emitting diode (light emitting diode, LED) because of possess have that volume is little, power saving and the feature such as durable, be increasingly becoming the light source of a new generation.LED operation voltage is low, can active illuminating and have certain brightness, brightness voltage available or electric current regulation, be provided simultaneously with impact resistance, anti-vibration, the feature of life-span length (100,000 hours).So light emitting diode is widely used in various terminal units and lighting field, such as car headlamp, traffic light, indicator by character, billboard and big screen video display units, to fields such as regular grade architectural lighting and LCD backlight all often it can be seen that the application of light emitting diode.
Existing driving means is when being driven multiple LED strip row, due to the current-limiting apparatus of driving means and the change of the LED strip upper electric current of row cannot be reacted in time and change its cut-off current, therefore the damage of LED strip row it is likely to result in, the immediate current that the abrupt voltage wave such as produced when circuit terminal loose contact is i.e. likely to result on LED strip row is excessive, and causes LED strip row to damage.
" background technology " paragraph is used only to help to understand present invention, therefore may comprise some in the content disclosed by " background technology " paragraph and not constitute in art the known technology known to those of ordinary skill.In the content disclosed by " background technology " paragraph, do not represent this content or the one or more embodiment of present invention problem to be solved, known by those of ordinary skill in art before the present patent application or cognitive.
Summary of the invention
The present invention provides a kind of light source drive device and light source driving method, can be prevented effectively from light emitting diode and damage.
Other objects of the present invention and advantage can be further understood from the technical characteristic that disclosed herein.
For reaching one of above-mentioned or partly or entirely purpose or other purposes, one embodiment of the invention provides a kind of light source drive device, and in order to drive multiple LED serial, light source drive device includes driver element, flow-restriction and control unit.The anode of first light emitting diode during wherein driver element couples each LED serial, outputting drive voltage is with driven for emitting lights diode tandem.Flow-restriction couples the negative electrode of last light emitting diode in each LED serial, and LED serial is carried out current limliting, detects the voltage of the negative electrode of last light emitting diode in each LED serial, and reset voltage according to this.Control unit couples driver element and flow-restriction, judge whether feedback voltage falls within outside predetermined voltage range, if feedback voltage falls within outside predetermined voltage range, control driver element and driving voltage is adjusted to starting voltage value, and the magnitude of voltage of the driving voltage that gradually adds up is not until feedback voltage falls within outside predetermined voltage range.
In one embodiment of this invention, wherein flow-restriction has multiple electric current threshold value, control unit also after every time adjusting driving voltage, corresponding adjust after driving voltage select electric current threshold value one of them as the electric current threshold value of flow-restriction.
In one embodiment of this invention, wherein control unit also judge feedback voltage fall within predetermined voltage range outer time, close driver element.
In one embodiment of this invention, wherein control unit is the magnitude of voltage of driving voltage of gradually adding up with fixed voltage value.
In one embodiment of this invention, wherein feedback voltage is the maximum voltage that flow-restriction detects in each LED serial obtained by the voltage of the negative electrode of last light emitting diode.
For reaching one of above-mentioned or partly or entirely purpose or other purposes, one embodiment of the invention provides a kind of light source driving method, and in order to drive multiple LED serial, light source driving method comprises the following steps.Outputting drive voltage is to the anode of first light emitting diode in each LED serial, with driven for emitting lights diode tandem.Detect the voltage of the negative electrode of last light emitting diode in each LED serial, and produce feedback voltage according to this.Judge whether feedback voltage falls within outside predetermined voltage range.If feedback voltage falls within outside predetermined voltage range, driving voltage is adjusted to starting voltage value, and the magnitude of voltage of the driving voltage that gradually adds up is not until feedback voltage falls within outside predetermined voltage range.
In one embodiment of this invention, light source driving method also includes, adjusts the electric current threshold value of current limliting LED serial according to the driving voltage after adjusting.
In one embodiment of this invention, if wherein feedback voltage falls within outside predetermined voltage range, light source driving method also includes, stops driven for emitting lights diode tandem.
In one embodiment of this invention, the most gradually the add up magnitude of voltage of driving voltage is until the feedback voltage step that do not falls within outside predetermined voltage range includes, the magnitude of voltage of the driving voltage that gradually adds up with fixed voltage value is not until feedback voltage falls within outside predetermined voltage range.
In one embodiment of this invention, wherein feedback voltage is to detect in each LED serial the maximum voltage obtained by the voltage of the negative electrode of last light emitting diode.
Based on above-mentioned, embodiments of the invention detect from the feedback voltage of LED serial fall within predetermined voltage range outer time, the driving voltage of LED serial is adjusted to starting voltage value, and readjust driving voltage, gradually add up driving voltage magnitude of voltage until feedback voltage do not fall within outside predetermined voltage range, to avoid light emitting diode to damage.
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the light source drive device illustrating one embodiment of the invention.
Fig. 2 is the schematic flow sheet of the light source driving method illustrating one embodiment of the invention.
Fig. 3 is the schematic flow sheet of the light source driving method illustrating another embodiment of the present invention.
Detailed description of the invention
For the present invention aforementioned and other technology contents, feature and effect, in the detailed description of a preferred embodiment of following cooperation accompanying drawing, can clearly present.The direction term being previously mentioned in following example, such as: upper and lower, left and right, front or rear etc., is only the direction with reference to accompanying drawing.Therefore, the direction term of use is used to illustrate not for limiting the present invention.
Fig. 1 is the schematic diagram of the light source drive device illustrating one embodiment of the invention.Refer to Fig. 1.Light source drive device 100 is in order to drive multiple LED serial LS (as a example by Fig. 1 illustrates three LED serials LS1, LS2, LS3), and light source drive device 100 includes driver element 102, flow-restriction 104 and control unit 106.Driver element 102 couples multiple LED serial LS, wherein in each LED serial LS, the anode of first light emitting diode L1 is coupled to driver element 102, in each LED serial LS, the negative electrode of last light emitting diode LN is then coupled to flow-restriction 104, it addition, control unit 106 couples driver element 102 and flow-restriction 104.
The exportable driving voltage of driver element 102 drives above-mentioned multiple LED serial LS to carry out luminescence.Flow-restriction 104 can carry out current limliting to above-mentioned multiple LED serial LS, and detects the voltage of the negative electrode of last light emitting diode LN in each LED serial LS, and reset voltage Vfb is to control unit 106 according to this.Control unit 106 can determine whether whether feedback voltage Vfb falls within outside predetermined voltage range, the cathode voltage size of last light emitting diode LN during wherein feedback voltage Vfb can react LED serial LS, that is according to feedback voltage Vfb, control unit 106 can judge that the cathode voltage of light emitting diode LN is the most too small or excessive.When control unit 106 judges that feedback voltage Vfb falls within outside predetermined voltage range, i.e. the cathode voltage of light emitting diode LN too small or excessive time, control unit 106 controls the driving voltage that driver element 102 outputs it and is adjusted to starting voltage value, and the magnitude of voltage of driver element 102 outputting drive voltage that gradually adds up is not until the feedback voltage Vfb of flow-restriction 104 output falls within outside predetermined voltage range.Wherein the magnitude of voltage mode of adding up of driving voltage can such as gradually add up with fixed voltage value, or increase along with cumulative number of times and reduce cumulative magnitude of voltage, but is not limited to this.
For example, feedback voltage Vfb can such as be set as that flow-restriction 104 detects in each LED serial LS voltage maximum in the magnitude of voltage obtained by the cathode voltage of last light emitting diode LN, and predetermined voltage range can such as be set as 0.2V～1V, if control unit 106 judges that feedback voltage Vfb is 1.2V, that is feedback voltage Vfb fall within predetermined voltage range outer time, the driving voltage that control driver element 102 outputs it is adjusted to 0V (that is starting voltage value is 0V) by control unit 106, and the magnitude of voltage of driver element 102 outputting drive voltage of starting gradually to add up, such as add up in the way of every time increasing 0.5V the magnitude of voltage of driving voltage, until feedback voltage Vfb returns in this predetermined voltage range of 0.2V～1V.Wherein, the driving voltage that control driver element 102 outputs it is adjusted to the mode of 0V and can for example, reach through being closed by driver element 102 by control unit 106, then restarts driver element 102 and starts the magnitude of voltage of cumulative driving voltage.
It should be noted that, the magnitude of voltage that above-mentioned predetermined voltage range, starting voltage value and driving voltage add up every time is only exemplary embodiment, it is naturally not limited to this, its also may be set to different numerical value, such as predetermined voltage range can be 0.2V～0.8V, starting voltage value can be 0.1V, the magnitude of voltage of the most cumulative driving voltage can be 1V.
In addition, in the present embodiment, the LED serial of LED serial LS1, LS2, LS3 for example, same type, the exportable identical driving voltage of driver element 102 drives above-mentioned LED serial LS1, LS2, LS3 to carry out luminescence respectively, so flow-restriction 104 can have an electric current threshold value.But in other embodiments; the most different types of LED serial of LED serial LS1, LS2, LS3; each LED serial LS1, LS2, LS3 may be respectively necessary for different driving voltages; so flow-restriction 104 can have multiple electric current threshold value; different driving voltages is allowed to need corresponding different electric current threshold value, so that all LED serial LS can obtain optimal protection.Therefore, after each control unit 106 adjusts the driving voltage of driver element 102 output, the driving voltage after control unit 106 also can corresponding adjust selects one of above-mentioned multiple electric current threshold values as the electric current threshold value of flow-restriction 104.For example, every time adjust after driver element 102 exports the driving voltage to LED serial LS1, LS2, LS3 when control unit 106, control unit 106 can according to adjust after driving voltage select respective leds tandem LS1, LS2, LS3 electric current threshold value one of them as the electric current threshold value of flow-restriction 104, such as may select the electric current threshold value as flow-restriction 104 of the reckling in the electric current threshold value of respective leds tandem LS1, LS2, LS3.
As mentioned above, by flow-restriction 104 detect from the feedback voltage of LED serial LS fall within predetermined voltage range outer time, the driving voltage of LED serial is adjusted to the magnitude of voltage of starting voltage value the driving voltage that gradually adds up until feedback voltage does not falls within outside predetermined voltage range, abrupt voltage wave can be avoided to damage LED serial LS, and the load change of respective leds tandem LS driver element 102 can be allowed to export optimal driving voltage carry out driven for emitting lights diode tandem LS, effectively protect LED serial LS and make its normal operation.
Fig. 2 is the schematic flow sheet of the light source driving method illustrating one embodiment of the invention, refer to Fig. 2.From the embodiment of Fig. 1, the method for light source drive device driven for emitting lights diode tandem can comprise the following steps.First, the anode of first light emitting diode in outputting drive voltage to each LED serial, with driven for emitting lights diode tandem (step S202).Then, detect the voltage of the negative electrode of last light emitting diode in each LED serial, and produce feedback voltage (step S204) according to this, wherein feedback voltage can for example, detect the maximum voltage in each LED serial obtained by the voltage of the negative electrode of last light emitting diode, but is not limited to this.Then, judge whether feedback voltage falls within predetermined voltage range outer (step S206), if feedback voltage falls within outside predetermined voltage range, driving voltage is adjusted to a starting voltage value, and the magnitude of voltage of the driving voltage that gradually adds up is not until feedback voltage falls within outside predetermined voltage range (step S208), after wherein driving voltage is adjusted every time, the electric current threshold value of LED serial is also adjusted to the corresponding electric current threshold value adjusting rear drive voltage.And if back coupling electricity is not pressed and fallen within outside predetermined voltage range, then returning to step S202, continuing to put out driving voltage driven for emitting lights diode tandem.
Fig. 3 is the schematic flow sheet of the light source driving method illustrating another embodiment of the present invention, refer to Fig. 3.In the present embodiment, light source driving method also includes step S302 and S304, wherein step S302 can perform after step S206, and step S304 step of replacing S208, that is after step S206 judges that feedback voltage falls within outside predetermined voltage range, first stop driven for emitting lights diode tandem (step S302), so that driving voltage is adjusted to starting voltage value, it is to avoid LED serial is damaged by abrupt voltage wave.Then step S304 is entered back into, gradually add up with fixed voltage value driving voltage magnitude of voltage until feedback voltage do not fall within outside predetermined voltage range, the most in some embodiments, the cumulative mode of the magnitude of voltage of driving voltage also for example, can increase along with the accumulative frequency of driving voltage and reduce cumulative magnitude of voltage.
In sum, the light source drive device of embodiments of the invention and light source driving method at least have one of them advantage following: embodiments of the invention by detect from the feedback voltage of LED serial fall within predetermined voltage range outer time, the driving voltage of LED serial is adjusted to starting voltage value, and the magnitude of voltage of the driving voltage that gradually adds up is not until feedback voltage falls within outside predetermined voltage range, to avoid abrupt voltage wave to damage LED serial, and the load change of respective leds tandem allows the driver element optimal driving voltage of output carry out driven for emitting lights diode tandem, effectively protect LED serial and make its normal operation.It addition, after the driving voltage of each control unit adjustment driver element output, one of driving voltage multiple electric current threshold values of selection after control unit meeting correspondence adjustment are as the electric current threshold value of flow-restriction, so that LED serial can obtain optimal protection.
The foregoing is only the preferred embodiments of the present invention, it is impossible to limit the scope that the present invention implements, all simple equivalence changes made according to claims of the present invention and description and amendment with this, all still fall within the scope that patent of the present invention contains.Additionally any embodiment or the claim of the present invention is not necessary to reach the whole purposes that disclosed herein or advantage or feature.Additionally, summary and denomination of invention are intended merely to assist patent document search to be used, not it is used for limiting the interest field of the present invention.Furthermore, first, second mentioned in description ... wait term, only in order to represent the title of element, not it is used for limiting the upper limit in number of elements or lower limit.
[symbol description]
100: light source drive device
102: driver element
104: flow-restriction
106: control unit
LS, LS1, LS2, LS3: LED serial
L1, LN: light emitting diode
Vfb: feedback voltage
The process step of S202～S208, S302～S304: light source driving method.
Claims (10)
1. a light source drive device, in order to drive multiple LED serial, this light source drives dress
Put and include:
One driver element, couples the anode of first light emitting diode in each described LED serial,
Export a driving voltage to drive these LED serials；
One flow-restriction, couples the moon of last light emitting diode in each described LED serial
These LED serials are carried out current limliting by pole, detect in each described LED serial last
The voltage of the negative electrode of one light emitting diode, and export a feedback voltage according to this；And
One control unit, couples this driver element and this flow-restriction, it is judged that whether this feedback voltage falls
Outside a predetermined voltage range, if this feedback voltage falls within outside this predetermined voltage range, control this driving
This driving voltage is adjusted to a starting voltage value, and the magnitude of voltage of this driving voltage that gradually adds up by unit
Until this feedback voltage does not falls within outside this predetermined voltage range.
2. light source drive device as claimed in claim 1, it is characterised in that this flow-restriction has
Multiple electric current threshold values, this control unit also after adjusting this driving voltage every time, after corresponding adjustment
Driving voltage select these electric current threshold values one of them as the electric current threshold value of this flow-restriction.
3. light source drive device as claimed in claim 1, it is characterised in that this control unit also exists
Judge, when this feedback voltage falls within outside this predetermined voltage range, to close this driver element.
4. light source drive device as claimed in claim 1, it is characterised in that this control unit be with
One fixed voltage value gradually adds up the magnitude of voltage of this driving voltage.
5. light source drive device as claimed in claim 1, it is characterised in that this feedback voltage is for being somebody's turn to do
Flow-restriction detects the voltage of the negative electrode of last light emitting diode in each described LED serial
Obtained maximum voltage.
6. a light source driving method, in order to drive multiple LED serial, this light source driving side
Method includes:
Export a driving voltage to the sun of first light emitting diode in each described LED serial
Pole, to drive these LED serials；
Detect the voltage of the negative electrode of last light emitting diode in each described LED serial, and
Produce a feedback voltage according to this；
Judge whether this feedback voltage falls within outside a predetermined voltage range；
If this feedback voltage falls within outside this predetermined voltage range, this driving voltage is adjusted to an initial electricity
Pressure value, and the magnitude of voltage of this driving voltage that gradually adds up is not until this feedback voltage falls within this predeterminated voltage
Outside scope.
7. light source driving method as claimed in claim 6, it is characterised in that also include:
The electric current threshold of these LED serials of current limliting is adjusted according to this driving voltage after adjusting
Value.
8. light source driving method as claimed in claim 6, it is characterised in that if this feedback voltage falls
Outside this predetermined voltage range, this light source driving method also includes:
Stop driving these LED serials.
9. light source driving method as claimed in claim 6, it is characterised in that gradually add up this driving
The magnitude of voltage of voltage is until the step that this feedback voltage does not falls within outside this predetermined voltage range includes:
With a fixed voltage value gradually add up this driving voltage magnitude of voltage until this feedback voltage do not fall within
Outside this predetermined voltage range.
10. light source driving method as claimed in claim 6, it is characterised in that this feedback voltage is for detecing
Survey in each described LED serial obtained by the voltage of the negative electrode of last light emitting diode
Big voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136623.6A CN106163027B (en) | 2015-03-26 | 2015-03-26 | Light source drive device and light source driving method |
| TW104119441A TWI561112B (en) | 2015-03-26 | 2015-06-16 | Light source driving apparatus and light source driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136623.6A CN106163027B (en) | 2015-03-26 | 2015-03-26 | Light source drive device and light source driving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106163027A true CN106163027A (en) | 2016-11-23 |
| CN106163027B CN106163027B (en) | 2018-12-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510136623.6A Expired - Fee Related CN106163027B (en) | 2015-03-26 | 2015-03-26 | Light source drive device and light source driving method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106163027B (en) |
| TW (1) | TWI561112B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201635862A (en) | 2016-10-01 |
| TWI561112B (en) | 2016-12-01 |
| CN106163027B (en) | 2018-12-04 |
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